57*100/X/1.05/90*100=78
    55*100/X/1.05/90*100=78
    68*100/X/1.05/90*100=78
    (548-y)/y＝2.2%
    (550.1-y)/y＝2%
    (518.6-y)/y＝2.2%
    (524.2-y)/y＝2.4%
    (2146.5-y)/y＝3.1%
    (2361.3-y)/y＝3.3%
    (5112.8-y)/y＝7.3%
    (5047.7-y)/y＝7.3%
    (5447.7-y)/y＝7.3%
    (5514.7-y)/y＝7%
    (5322.6-y)/y＝7.4%
    x^4+x^2+1=0
    2a^4-2238729a^2+563914=0
    2b^4-2238729b^2+563914=0
    x^2-10x-16=0
    Rec(65.1245，171.4486111)=
    x=193747.8047+14.08%x/5

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